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GF38 4-Stroke RC Gasoline Engines

Owner’s Operating Instruction Manual

Dear customer:

Thank you for purchasing NGH GF38 4-stroke gasoline engine. the engine has been developed by NGH engineers to

offer all hobbyists a new 4-stroke engine. You will be delighted with stability, fuel economy, energy saving,

environmental protection, low noise, large torque output of your NGH GF38. We hope that you will enjoy with your the

engine, and have many fun and safe flying experiences with its use.

Safety Instruction and WARNINGS!

Please read the instruction manual to become familiar with the features of the product before operating. Failure to

operate the product correctly can result in damage to the product, personal property and cause serious injury.

GF38 engine is NGH R&D manufacturing precision products. It must be operated with caution and common sense and

requires some basic mechanical ability. This product is not intended for use by children without direct adult supervision.

Don’t attempt disassembly, use with incompatible components or augment product in any way without the approval of

our company. It is to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in

order to operate correctly and avoid damage or serious injury.

Age Recommendation: RC engine is not a toy! Not for children under 15 years.

The engine is designed for use on a model radio control airplane. If it is used for any purpose, we cannot be responsible

for its reliability of safety.

·NGH or their dealers aren’t responsible for any loss, injury or damage resulting from the miss-use of RC engine.

·Keep away from the rotating propeller area while operating the engine.

·Do not wear loose clothing near the engine or the propeller.

·Do not operate the engine near loose material such as dirt, gravel, ropes, sand, etc.

·Always run your model engine in a well-ventilated area. Model engines produce possibly harmful carbon monoxide

fumes.

·Always ensure that the propeller is securely attached to the engine shaft and all retaining fasteners are tightened

properly before each flight.

·Always stand clear of and behind the propeller, ensure the face and body are far away from the propeller blade after

trajectory. Never allow anyone, to be in front of or to the sides of the propeller when starting or running the engine.

·Always ensure that small parts in the children can’t touch place to prevent children from swallowing parts;

·Always check the propeller nut tightening.

·Gasoline is extremely flammable. Be careful of any sparks from electrical contacts such as fuel pumps, battery

charger, etc.

·Allow your engine stop and cool before touching or fueling. The running engine of the surface temperature is high,

easy to cause burns and other personal injury.

·Be sure to check whether there are loose bolts before flying. When install a muffler, the muffler in the threads of the

screw into the engine exhaust, until twist fixed, it is recommended to use screw glue.

·Ensure the engine and muffler in aircraft fairing environment with cold air, make sure the engine cooling.

Product Specifications：

Type：4 - stroke air cooled gasoline engine（Only used for fixed-wing aircraft model）

Bore：39mm

Stroke：31.8mm

Volume：37.97cc Carburetor：Walbro WT1022

Mix Output：3.58 HP/8300rpm RPM Range：1600-8000rpm

Ignition：NGH Automatic advancing angle ignition (RoHS and CE Certified；Rcexl Manufactured)

Ignition Power：DC 4.8V - 8.4V 1000mAH Spark plug type：CM6

Fuel: 93# Unleaded gasoline + Fully synthetic lubricants

(Non-4-stroke lubricants)

Mixing ratio： oil :Lubrication = 35:1

Recommended propeller：18×8-10、19x8-10、20×8

（Two blades）

Weight：engine 1310g、ignition 100g

Summary of content (6 pages)

PAGE 1
GF38 4-Stroke RC Gasoline Engines Owner’s Operating Instruction Manual Dear customer: Thank you for purchasing NGH GF38 4-stroke gasoline engine. the engine has been developed by NGH engineers to offer all hobbyists a new 4-stroke engine. You will be delighted with stability, fuel economy, energy saving, environmental protection, low noise, large torque output of your NGH GF38. We hope that you will enjoy with your the engine, and have many fun and safe flying experiences with its use.
PAGE 2
Installation of carburetor components： Following the above pictures connect the carburetor. Please attention the five ellipse holes and 90° of the mounting bracket (F38264), and these five ellipse holes used to adjust position. Mounting bracket at 90 degrees can be intake manifold (F38224) and the mounting surface integrity (If not 90°, it must be to adjust). Make sure the intake manifold (F38224) will not rupture by pull down and up compressions. Above pictures ①-⑦ are fastening screws.
PAGE 3
Adjust Carburetor: When the engine running, you want to adjust the carburetor, please adjust it based on factory Settings: In the process of adjusting the carburetor, please use a high-quality tachometer to determine your adjusted results, the tachometer you need to buy one. First adjust the high speed needle: Engine run time will be turned on at full throttle position, adjust the high needle and watch the change of the tachometer, make the engine rpm reach the max per minute.
PAGE 4
Engine installation: NGH 4-stroke engine mounted on a suitable RC aircraft has two common ways of installation, as shown below: FIG. 3 FIG. 4 FIG. 3: Rail bracket installation; FIG. 4: Rear bracket installation. We suggest that RC hobbyist use "FIG. 3" installation. It can effectively reduce the high frequency vibration of four-stroke engine running at a high speed.
PAGE 5
Engine Maintenance: To reduce the fuel consumption, extend engine’s life, please adjust the engine’s highest speed and make engine run in the output maximum speed of 90% once the gas pedal full opened. If the load is large ( Propeller’s diameter and screw pitch are big ), the fuel must be adequate.
PAGE 6